WWiSE IEEE 802.11n Proposal Authors: Date: 2005-03-04 Notice: This document has been prepared to assist IEEE 802.11. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.11. Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures <http:// ieee802.org/guides/bylaws/sb-bylaws.pdf>, including the statement "IEEE standards may include the known use of patent(s), including patent applications, provided the IEEE receives assurance from the patent holder or applicant with respect to patents essential for compliance with both mandatory and optional portions of the standard." Early disclosure to the Working Group of patent information that might be relevant to the standard is essential to reduce the possibility for delays in the development process and increase the likelihood that the draft publication will be approved for publication. Please notify the Chair <stuart.kerry@philips.com> as early as possible, in written or electronic form, if patented technology (or technology under patent application) might be incorporated into a draft standard being developed within the IEEE 802.11 Working Group. If you have questions, contact the IEEE Patent Committee Administrator at <patcom@ieee.org>. Sean Coffey, Realtek, et al.

Additional authors: VK Jones Airgo Networks vkjones@airgonetworks.com Richard van Nee richardvannnee@airgonetworks.com Ali Raissinia aliraissinia@airgonetworks.com Allert van Zelst allertvanzelst@airgonetworks.com Bruce Edwards Broadcom bedwards@broadcom.com Matthew Fischer mfischer@broadcom.com Chris Hansen chansen@broadcom.com Tushar Moorti tushar@broadcom.com Chris Young cyoung@broadcom.com Takashi Ishidoshiro Buffalo doshir@melcoinc.co.jp Masato Kato mkato@melcoinc.co.jp Dave Hedberg Conexant dave.hedberg@conexant.com Cenk Kose cenk.kose@conexant.com Jim Petranovich jim.petranovich@conexant.com Sean Coffey, Realtek, et al.

Additional authors: Michael Seals Conexant michael.seals@conexant.com Mark Webster mark.webster@conexant.com Menzo Wentink menzo.wentink@conexant.com Taehyun Jeon ETRI thjeon@etri.re.kr Sok-kyu Lee sk-lee@etri.re.kr Heejung Yu heejung@etri.re.kr Mustafa Eroz Hughes Network Systems feroz@hns.com Lakshmi Iyer liyer@hns.com Lin-Nan Lee llee@hns.com Feng-Wen Sun fsun@hns.com Marc de Courville Motorola marc.de.courville@motorola.com Marcus Muck gabriella.convertino@st.com Alexandre Ribeiro-Dias alexandre.ribeirodias@motorola.com Sean Coffey, Realtek, et al.

Additional authors: Stephanie Rouquette-Leveil Motorola stephanie.rouquette@motorola.com Sebastien Simoens sebastien.simoens@motorola.com John Chang Ralink john_chang@ralinktech.com.tw Sheng Lee shenghlee@ralinktech.com Tom Pare tpare@ralinktech.com David Tung dtung@ralinktech.com Stephan ten Brink Realtek stenbrink@realtek-us.com Gabriella Convertino STMicroelectronics gabriella.convertino@st.com Mike Moreton mike.moreton@st.com Fabio Osnato fabio.osnato@st.com Pratima Pai pratima.pai@st.com Vincenzo Scarpa vincenzo.scarpa@st.com Massimiliano Siti massimiliano.siti@st.com Sean Coffey, Realtek, et al.

Additional authors: George Vlantis STMicroelectronics george.vlantis@st.com Anuj Batra Texas Instruments batra@ti.com Srikanth Gummadi sgummadi@ti.com Dale Hocevar hocevar@ti.com Richard Williams richard@ti.com Keith Chugg TrellisWare kchugg@trellisware.com Paul Gray pgray@trellisware.com Bob Ward bward@trellisware.com Jeng-Hong Chen Winbond Electronics jhchen2@winbond.com Pansop Kim pkim@winbond.com Alfred Lin halin@winbond.com Wei-Chung Peng wcpeng0@winbond.com Sean Coffey, Realtek, et al.

Abstract The presentation summarizes the changes to the WWiSE proposal since the January meeting: What’s new since last meeting … New members Proposal updates Enhanced single receive antenna modes Enhanced design for optimal backward compatibility New LDPC code design New technical information Sean Coffey, Realtek, et al.

Expanded membership Airgo Networks Broadcom Buffalo Conexant ETRI Hughes Network Systems Motorola Ralink Realtek STMicroelectronics Texas Instruments TrellisWare Winbond The WWiSE and Motorola complete proposals have merged Sean Coffey, Realtek, et al.

Proposal updates Enhanced single-receive-antenna modes Enhanced design for backward compatibility New LDPC code design Beacon enhancement for longer range, low rate Sean Coffey, Realtek, et al.

Enhanced single-receive-antenna modes Previously the WWiSE proposal had 2x1 space-time block coded modes Very low complexity Modular add-on to other modes The revised proposal extends this mode to 3x1 and 4x1 antenna configurations This is accomplished by building on the 2x1 modes, cycling the 2 transmit antennas across the array Very simple Improves robustness by exploiting all available diversity Sean Coffey, Realtek, et al.

Single-receive-antenna modes, contd. Single receive antenna modes are of the highest importance for lowest power, lowest cost applications PHY data rates of up to 135 Mbps are achieved in these 2x1, 3x1, and 4x1 modes This enables highly robust, ultra-low-cost communication achieving the 100 Mbps throughput mandate There are no corresponding modes in the other proposal Sean Coffey, Realtek, et al.

Enhanced preamble design Design of short and long sequences in mixed mode have been modified Same general format, with new cyclic shifts Revised version uses a 200 ns cyclic advance instead of 400 ns cyclic delay for 2 Tx antennas mixed mode Same cyclic shifts apply to long sequence and SIG-N field Improves performance of cross-correlation detectors Sean Coffey, Realtek, et al.

Enhanced preamble design, contd. New technical information (separate presentation): effect of revised WWiSE preamble on legacy equipment from expanded set of vendors: Atheros Broadcom Conexant Intel Marvell Texas Instruments Comparison to effect of TGnSync preamble and original WWiSE preamble Sean Coffey, Realtek, et al.

New LDPC code design New design is regularly structured, supports fast convergence and parallel memory accesses Supports layered belief propagation Improved performance See separate presentation for comparison of WWiSE and TGnSync performances at all code rates, and 12 and 50 iterations WWiSE performance always equivalent or better than TGnSync design at each rate and number of iterations considered Sean Coffey, Realtek, et al.

Beacon enhancement n-beacon added SIG-N field repeated Brings advantages of 2x1, 3x1, and 4x1 modes to maximum range I.e., 6 Mbps modes have SIGNAL field of required robustness New beacon is optional, due to optionality of 2x1, 3x1, and 4x1 modes Sean Coffey, Realtek, et al.

References and further information IEEE 802.11/05-0149-00-000n, “WWiSE group PHY and MAC specification,” C. Kose, B. Edwards, et al. IEEE 802.11/04-0877-09-000n, “WWiSE proposal response to functional requirements and comparison criteria,” C. Hansen, M. Fischer, et al. IEEE 802.11/04-0935-r3-000n and –r4-000n, IEEE 802.11/05-1591r3, “WWiSE complete proposal presentation,” S. Coffey et al. IEEE 802.11/05-0016-00-000n, “WWiSE MAC proposal for TGn,” M. Fischer, et al. See also www.wwise.org Or send email to info@wwise.org Sean Coffey, Realtek, et al.